add comment + update unit test

coral-hive/src/main/antlr/roots/com/linkedin/coral/hive/hive2rel/parsetree/parser/HiveParser.g

@@ -657,6 +657,12 @@ import org.slf4j.LoggerFactory;
     this.hiveConf = hiveConf;
   }
   protected boolean useSQL11ReservedKeywordsForIdentifier() {
+    /*
+     * This enables the translation of keywords as column names without adding backquotes. This is required for translating views
+     * created using spark engine as certain keywords in hive like timestamp are not keywords in spark. This will
+     * result in creation of views without backquoting those keywords. This should return false when coral-spark becomes
+     * a supported LHS for translations.
+     */
     return true;
   }
 }

coral-hive/src/test/java/com/linkedin/coral/hive/hive2rel/TestUtils.java

@@ -174,9 +174,8 @@ public static TestHive setupDefaultHive(HiveConf conf) throws IOException {
       driver.run("CREATE VIEW IF NOT EXISTS view_schema_evolve_wrapper AS SELECT * from view_schema_evolve");
       driver.run("ALTER TABLE schema_evolve CHANGE COLUMN b b array<struct<b1:string, b2:double, b3:int>>");
 
-      driver.run("CREATE OR REPLACE VIEW test.spark_created_view AS SELECT 1 AS `timestamp` FROM test.tableOne");
-      // Simulate the creation of view using spark by setting the corresponding table property of the view.
-      driver.run("ALTER VIEW test.spark_created_view SET TBLPROPERTIES ('spark.sql.create.version'='3.1.1')");
+      driver.run(
+          "CREATE OR REPLACE VIEW test.quoted_reserved_keyword_view AS SELECT 1 AS `timestamp` FROM test.tableOne");
 
       CommandProcessorResponse response = driver
           .run("create function test_tableOneView_LessThanHundred as 'com.linkedin.coral.hive.hive2rel.CoralTestUDF'");

coral-hive/src/test/java/com/linkedin/coral/hive/hive2rel/parsetree/ParseTreeBuilderTest.java

@@ -236,12 +236,12 @@ public void testUnsupportedOuterExplodeWithoutColumns() {
   }
 
   /**
-   * Validates if coral-hive can translate views with unquoted reserved keywords when the views are created using spark.
+   * Validates if coral-hive can translate views with unquoted reserved keywords as column names.
    */
   @Test
   public void testUnquotedKeywordAsColumnName() {
     HiveToRelConverter hiveToRelConverter = new HiveToRelConverter(msc);
-    Table table = msc.getTable("test", "spark_created_view");
+    Table table = msc.getTable("test", "quoted_reserved_keyword_view");
     // Remove the backquotes associated with the view text
     String input = table.getViewExpandedText().replaceAll("`", "");
     SqlNode sqlNode = hiveToRelConverter.toSqlNode(input, table);